Replace framework.jar on Android Emulator

1. Start up Emulator
  $ cd {ANDROID SDK}/tools
  $ ./emulator -avd {AVD_NAME}
2. Use adb shell to set rw access right on /system
  $ ./adb shell
  # mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system
  # cd /system/bin
  # cat sh > su
  # chmod 4755 su
  # exit
3. upload framework.jar to target directory
  $ ./adb push
 {MYDONUT_OUT_PATH}/target/product/generic/system/framework/framework.jar /system/framework
4. restart Emulator
  $ ./adb shell
  # stop
  # start